[NFC][AMDGPU] Re-enable two tests previously disabled due to missing upstream features (#149568)

This PR re-enables two tests that were previously disabled because they
depended on features not yet upstreamed.

Author: shiltian

llvm/test/CodeGen/AMDGPU/llvm.amdgcn.rcp.bf16.ll

@@ -1,10 +1,9 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
-; xUN: llc -global-isel=0 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 < %s | FileCheck -check-prefix=SDAG-TRUE16 %s
+; RUN: llc -global-isel=0 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 < %s | FileCheck -check-prefix=SDAG-TRUE16 %s
 ; RUN: llc -global-isel=0 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=-real-true16 < %s | FileCheck -check-prefix=SDAG-FAKE16 %s
 ; xUN: llc -global-isel=1 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 < %s | FileCheck -check-prefix=GI-TRUE16 %s
 ; xUN: llc -global-isel=1 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=-real-true16 < %s | FileCheck -check-prefix=GI-FAKE16 %s
 
-; FIXME: t16 doesn't work at the moment because the store of s16 under t16 mode fails to select.
 ; FIXME: GlobalISel does not work with bf16
 
 declare bfloat @llvm.amdgcn.rcp.bf16(bfloat) #0

llvm/test/CodeGen/AMDGPU/llvm.amdgcn.rsq.bf16.ll

@@ -1,10 +1,9 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
-; xUN: llc -global-isel=0 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 %s -o - | FileCheck -check-prefix=SDAG-REAL16 %s
+; RUN: llc -global-isel=0 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 %s -o - | FileCheck -check-prefix=SDAG-REAL16 %s
 ; RUN: llc -global-isel=0 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=-real-true16 %s -o - | FileCheck -check-prefix=SDAG-FAKE16 %s
 ; xUN: llc -global-isel=1 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 %s -o - | FileCheck -check-prefix=GISEL-REAL16 %s
 ; xUN: llc -global-isel=1 -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=-real-true16 %s -o - | FileCheck -check-prefix=GISEL-FAKE16 %s
 
-; FIXME: t16 doesn't work at the moment because the store of s16 under t16 mode fails to select.
 ; FIXME: GlobalISel does not work with bf16
 
 declare bfloat @llvm.amdgcn.rsq.bf16(bfloat) #0

llvm/test/CodeGen/AMDGPU/llvm.sqrt.bf16.ll

@@ -2,8 +2,6 @@
 ; RUN: llc -amdgpu-scalarize-global-loads=false -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=+real-true16 -mattr=-flat-for-global < %s | FileCheck -check-prefixes=GFX12-TRUE16 %s
 ; RUN: llc -amdgpu-scalarize-global-loads=false -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 -mattr=-real-true16 -mattr=-flat-for-global < %s | FileCheck -check-prefixes=GFX12-FAKE16 %s
 
-; FIXME: t16 doesn't work at the moment because the store of s16 under t16 mode fails to select.
-
 declare bfloat @llvm.sqrt.bf16(bfloat %a)
 declare <2 x bfloat> @llvm.sqrt.v2bf16(<2 x bfloat> %a)