AMDGPU: Add missing static to cl::opt (llvm#152747)

Author: arsenm

llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp

@@ -33,7 +33,7 @@ using namespace llvm;
 // optimal RC for Opc and Dest of MFMA. In particular, there are high RP cases
 // where it is better to produce the VGPR form (e.g. if there are VGPR users
 // of the MFMA result).
-cl::opt<bool> MFMAVGPRForm(
+static cl::opt<bool> MFMAVGPRForm(
     "amdgpu-mfma-vgpr-form", cl::Hidden,
     cl::desc("Whether to force use VGPR for Opc and Dest of MFMA. If "
              "unspecified, default to compiler heuristics"),