[CodeGen] Rename functions PrintReg* to printReg*

LLVM Coding Standards:
  Function names should be verb phrases (as they represent actions), and
  command-like function should be imperative. The name should be camel
  case, and start with a lower case letter (e.g. openFile() or isFoo()).

Differential Revision: https://reviews.llvm.org/D40416

llvm-svn: 319168
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp
index 3533ec3..dcca3a2 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp
@@ -27,7 +27,7 @@
   }
 
   if (isRegister())
-    OS << "Reg " << PrintReg(getRegister(), TRI) << '\n';
+    OS << "Reg " << printReg(getRegister(), TRI) << '\n';
   else
     OS << "Stack offset " << getStackOffset() << '\n';
 }