MC: Clean up method names in MCContext.

The naming was a mish-mash of old and new style. Update to be consistent
with the new. NFC.

llvm-svn: 237594
diff --git a/llvm/lib/Target/R600/AsmParser/AMDGPUAsmParser.cpp b/llvm/lib/Target/R600/AsmParser/AMDGPUAsmParser.cpp
index 930aed1..37ecf0f 100644
--- a/llvm/lib/Target/R600/AsmParser/AMDGPUAsmParser.cpp
+++ b/llvm/lib/Target/R600/AsmParser/AMDGPUAsmParser.cpp
@@ -1084,7 +1084,7 @@
 
     case AsmToken::Identifier:
       Operands.push_back(AMDGPUOperand::CreateExpr(
-          MCSymbolRefExpr::Create(getContext().GetOrCreateSymbol(
+          MCSymbolRefExpr::Create(getContext().getOrCreateSymbol(
                                   Parser.getTok().getString()), getContext()), S));
       Parser.Lex();
       return MatchOperand_Success;