Fix modules build of AVRAsmParser.cpp

Summary:
Without this change I get the following error:

lib/Target/AVR/AVRGenAsmMatcher.inc:1135:1: error: redundant #include of module 'LLVM_Utils.Support.Format' appears within namespace 'llvm' [-Wmodules-import-nested-redundant]

Reviewers: dylanmckay

Reviewed By: dylanmckay

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D53425

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346750 91177308-0d34-0410-b5e6-96231b3b80d8

Author: arichardson

lib/Target/AVR/AsmParser/AVRAsmParser.cpp

@@ -34,8 +34,9 @@
 
 #define DEBUG_TYPE "avr-asm-parser"
 
-namespace llvm {
+using namespace llvm;
 
+namespace {
 /// Parses AVR assembly from a stream.
 class AVRAsmParser : public MCTargetAsmParser {
   const MCSubtargetInfo &STI;
@@ -245,6 +246,8 @@ class AVROperand : public MCParsedAsmOperand {
   }
 };
 
+} // end anonymous namespace.
+
 // Auto-generated Match Functions
 
 /// Maps from the set of all register names to a register number.
@@ -708,5 +711,3 @@ unsigned AVRAsmParser::validateTargetOperandClass(MCParsedAsmOperand &AsmOp,
   }
   return Match_InvalidOperand;
 }
-
-} // end of namespace llvm