Sparc: silently ignore .proc assembler directive

llvm/trunk/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp

ParseDirective(AsmToken DirectiveID)
   if (is64Bit() && IDVal == ".xword")
     return parseDirectiveWord(8, DirectiveID.getLoc());
 
   if (IDVal == ".register") {
     // For now, ignore .register directive.
     Parser.eatToEndOfStatement();
     return false;
   }
+  if (IDVal == ".proc") {
+    // For compatibility, ignore this directive.
+    // (It's supposed to be an "optimization" in the Sun assembler)
+    Parser.eatToEndOfStatement();
+    return false;
+  }
 
   // Let the MC layer to handle other directives.
   return true;
 }
 
 bool SparcAsmParser:: parseDirectiveWord(unsigned Size, SMLoc L) {
   if (getLexer().isNot(AsmToken::EndOfStatement)) {
     for (;;) {

llvm/trunk/test/MC/Sparc/sparc-directives.s

 ! RUN: llvm-mc %s -arch=sparc   -show-encoding | FileCheck %s --check-prefix=SPARC32
 ! RUN: llvm-mc %s -arch=sparcv9 -show-encoding | FileCheck %s --check-prefix=SPARC64
 
+        ! '.proc' is documented to do nothing in the binutils assembler.
+        ! so it should do nothing for clang either, i.e. not be an error.
+        .proc 1
+
         ! SPARC32: .byte 24
         ! SPARC64: .byte 24
         .byte 24
 
         ! SPARC32: .half 1024
         ! SPARC64: .half 1024
         .half 1024
 
         ! SPARC32: .word 65536
         ! SPARC64: .word 65536
         .word 65536
 
         ! SPARC32: .word 65536
         ! SPARC64: .xword 65536
         .nword 65536