allow FMA discovery

Change-Id: Iea9c4892c27fd233c04ca441c7cc4fa6cf110dd4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274656
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Herb Derby <herb@google.com>

Author: Mike Klein

src/core/SkVM.cpp

@@ -2297,9 +2297,12 @@ namespace skvm {
             SkAssertResult(false == llvm::InitializeNativeTargetAsmPrinter());
         });
 
+        llvm::TargetOptions options;
+        options.AllowFPOpFusion = llvm::FPOpFusion::Fast;
         fEE = llvm::EngineBuilder(std::move(mod))
                     .setEngineKind(llvm::EngineKind::JIT)
                     .setMCPU(llvm::sys::getHostCPUName())
+                    .setTargetOptions(options)
                     .create();
         if (fEE) {
             fJITEntry = (void*)fEE->getFunctionAddress(debug_name);