CodeGen: Use asm register names in warning message

[arsenm]

Summary

This was using the ugly tablegenerated register enum names, which are
really hideous for register tuples on AMDGPU. Use the prettier names
which are recognized by the asm parser.

[arsenm]

a96dbb9035ea91adf369fcafffe49371806e971e

llvm/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp

for (unsigned I = InlineAsm::MIOp_FirstOperand, NumOps = MI->getNumOperands();
     }
     // Skip to one before the next operand descriptor, if it exists.
     I += InlineAsm::getNumOperandRegisters(Flags);
   }
 
   if (!RestrRegs.empty()) {
     std::string Msg = "inline asm clobber list contains reserved registers: ";
     ListSeparator LS;
-    for (const Register &RR : RestrRegs) {
+    for (const Register RR : RestrRegs) {
       Msg += LS;
-      Msg += TRI->getName(RR);
+      Msg += TRI->getRegAsmName(RR);
     }
     const char *Note =
         "Reserved registers on the clobber list may not be "
         "preserved across the asm statement, and clobbering them may "
         "lead to undefined behaviour.";
     MMI->getModule()->getContext().diagnose(DiagnosticInfoInlineAsm(
         LocCookie, Msg, DiagnosticSeverity::DS_Warning));
     MMI->getModule()->getContext().diagnose(

llvm/test/CodeGen/AMDGPU/inline-asm-reserved-regs.ll

 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs -o /dev/null 2>&1 %s | FileCheck -check-prefix=ERR %s
 
-; ERR: warning: inline asm clobber list contains reserved registers: VGPR42
+; ERR: warning: inline asm clobber list contains reserved registers: v42
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_occupancy_limited_vgpr() #0 {
 entry:
   call void asm sideeffect "; clobber $0", "~{v42}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: VGPR42_VGPR43
+; ERR: warning: inline asm clobber list contains reserved registers: v[42:43]
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_occupancy_limited_vgpr64() #0 {
 entry:
   call void asm sideeffect "; clobber $0", "~{v[42:43]}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: M0
+; ERR: warning: inline asm clobber list contains reserved registers: m0
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_m0() {
 entry:
   call void asm sideeffect "; clobber $0", "~{m0}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: EXEC
+; ERR: warning: inline asm clobber list contains reserved registers: exec
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_exec() {
 entry:
   call void asm sideeffect "; clobber $0", "~{exec}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: EXEC_LO
+; ERR: warning: inline asm clobber list contains reserved registers: exec_lo
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_exec_lo() {
 entry:
   call void asm sideeffect "; clobber $0", "~{exec_lo}"()
   ret void
 }
 
 ; FIXME: This should warn too