[CodeGen][ARM64EC] Define hybrid_patchable EXP thunk symbol as a function. (llvm#102898)

This is needed for MSVC link.exe to generate redirection metadata for hybrid patchable thunks.

(cherry picked from commit d550ada)

Author: cjacek

llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp

@@ -1292,6 +1292,13 @@ void AArch64AsmPrinter::emitGlobalAlias(const Module &M,
       StringRef ExpStr = cast<MDString>(Node->getOperand(0))->getString();
       MCSymbol *ExpSym = MMI->getContext().getOrCreateSymbol(ExpStr);
       MCSymbol *Sym = MMI->getContext().getOrCreateSymbol(GA.getName());
+
+      OutStreamer->beginCOFFSymbolDef(ExpSym);
+      OutStreamer->emitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL);
+      OutStreamer->emitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
+                                      << COFF::SCT_COMPLEX_TYPE_SHIFT);
+      OutStreamer->endCOFFSymbolDef();
+
       OutStreamer->beginCOFFSymbolDef(Sym);
       OutStreamer->emitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL);
       OutStreamer->emitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION

llvm/test/CodeGen/AArch64/arm64ec-hybrid-patchable.ll

@@ -240,6 +240,10 @@ define dso_local void @caller() nounwind {
 ; CHECK-NEXT:      .section        .drectve,"yni"
 ; CHECK-NEXT:      .ascii  " /EXPORT:exp"
 
+; CHECK-NEXT:      .def    "EXP+#func";
+; CHECK-NEXT:      .scl    2;
+; CHECK-NEXT:      .type   32;
+; CHECK-NEXT:      .endef
 ; CHECK-NEXT:      .def    func;
 ; CHECK-NEXT:      .scl    2;
 ; CHECK-NEXT:      .type   32;
@@ -252,6 +256,10 @@ define dso_local void @caller() nounwind {
 ; CHECK-NEXT:      .type   32;
 ; CHECK-NEXT:      .endef
 ; CHECK-NEXT:  .set "#func", "#func$hybpatch_thunk"{{$}}
+; CHECK-NEXT:      .def    "EXP+#has_varargs";
+; CHECK-NEXT:      .scl    2;
+; CHECK-NEXT:      .type   32;
+; CHECK-NEXT:      .endef
 ; CHECK-NEXT:      .def    has_varargs;
 ; CHECK-NEXT:      .scl    2;
 ; CHECK-NEXT:      .type   32;
@@ -264,6 +272,10 @@ define dso_local void @caller() nounwind {
 ; CHECK-NEXT:      .type   32;
 ; CHECK-NEXT:      .endef
 ; CHECK-NEXT:  .set "#has_varargs", "#has_varargs$hybpatch_thunk"
+; CHECK-NEXT:      .def    "EXP+#has_sret";
+; CHECK-NEXT:      .scl    2;
+; CHECK-NEXT:      .type   32;
+; CHECK-NEXT:      .endef
 ; CHECK-NEXT:      .def    has_sret;
 ; CHECK-NEXT:      .scl    2;
 ; CHECK-NEXT:      .type   32;
@@ -276,6 +288,10 @@ define dso_local void @caller() nounwind {
 ; CHECK-NEXT:      .type   32;
 ; CHECK-NEXT:      .endef
 ; CHECK-NEXT:  .set "#has_sret", "#has_sret$hybpatch_thunk"
+; CHECK-NEXT:      .def    "EXP+#exp";
+; CHECK-NEXT:      .scl    2;
+; CHECK-NEXT:      .type   32;
+; CHECK-NEXT:      .endef
 ; CHECK-NEXT:      .def    exp;
 ; CHECK-NEXT:      .scl    2;
 ; CHECK-NEXT:      .type   32;
@@ -295,18 +311,18 @@ define dso_local void @caller() nounwind {
 ; SYM:      [78](sec 20)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 #exp$hybpatch_thunk
 ; SYM:      [110](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 func
 ; SYM-NEXT: AUX indx 112 srch 3
-; SYM-NEXT: [112](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 EXP+#func
+; SYM-NEXT: [112](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 EXP+#func
 ; SYM:      [116](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 #func
 ; SYM-NEXT: AUX indx 53 srch 3
 ; SYM:      [122](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 has_varargs
 ; SYM-NEXT: AUX indx 124 srch 3
-; SYM-NEXT: [124](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 EXP+#has_varargs
+; SYM-NEXT: [124](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 EXP+#has_varargs
 ; SYM-NEXT: [125](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 has_sret
 ; SYM-NEXT: AUX indx 127 srch 3
-; SYM-NEXT: [127](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 EXP+#has_sret
+; SYM-NEXT: [127](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 EXP+#has_sret
 ; SYM-NEXT: [128](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 exp
 ; SYM-NEXT: AUX indx 130 srch 3
-; SYM-NEXT: [130](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 EXP+#exp
+; SYM-NEXT: [130](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 EXP+#exp
 ; SYM-NEXT: [131](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 #has_varargs
 ; SYM-NEXT: AUX indx 58 srch 3
 ; SYM-NEXT: [133](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 #has_sret