Add and call AMDGPUMCResourceInfo::reset method

When compiling multiple pipelines, the `MCRegisterInfo` instance in
`AMDGPUAsmPrinter` gets re-used even after finalization, so it calls
`finalize()` multiple times.

Add a reset method and call it in
`AMDGPUAsmPrinter::doInitialization`.

Author: Thomas Symalla

llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp

@@ -358,6 +358,9 @@ bool AMDGPUAsmPrinter::doInitialization(Module &M) {
       report_fatal_error("Unexpected code object version");
     }
   }
+
+  RI.reset();
+  
   return AsmPrinter::doInitialization(M);
 }
 

llvm/lib/Target/AMDGPU/AMDGPUMCResourceInfo.cpp

@@ -71,6 +71,13 @@ void MCResourceInfo::assignMaxRegs(MCContext &OutContext) {
   assignMaxRegSym(MaxSGPRSym, MaxSGPR);
 }
 
+void MCResourceInfo::reset() {
+  Finalized = false;
+  MaxVGPR = 0;
+  MaxAGPR = 0;
+  MaxSGPR = 0;
+}
+
 void MCResourceInfo::finalize(MCContext &OutContext) {
   assert(!Finalized && "Cannot finalize ResourceInfo again.");
   Finalized = true;

llvm/lib/Target/AMDGPU/AMDGPUMCResourceInfo.h

@@ -75,6 +75,8 @@ class MCResourceInfo {
   const MCExpr *getSymRefExpr(StringRef FuncName, ResourceInfoKind RIK,
                               MCContext &Ctx);
 
+  void reset();
+  
   // Resolves the final symbols that requires the inter-function resource info
   // to be resolved.
   void finalize(MCContext &OutContext);