*AsmBackend.cpp: Include StringSwitch.h

Summary:
They currently get the header from MCLinkerOptimizationHint.h, which
will be removed from MCAssembler.h.

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Differential Revision: https://phabricator.intern.facebook.com/D60251209

Author: MaskRay

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp

@@ -10,6 +10,7 @@
 #include "MCTargetDesc/AMDGPUFixupKinds.h"
 #include "MCTargetDesc/AMDGPUMCTargetDesc.h"
 #include "Utils/AMDGPUBaseInfo.h"
+#include "llvm/ADT/StringSwitch.h"
 #include "llvm/BinaryFormat/ELF.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAssembler.h"

llvm/lib/Target/AVR/MCTargetDesc/AVRAsmBackend.cpp

@@ -13,6 +13,7 @@
 #include "MCTargetDesc/AVRAsmBackend.h"
 #include "MCTargetDesc/AVRFixupKinds.h"
 #include "MCTargetDesc/AVRMCTargetDesc.h"
+#include "llvm/ADT/StringSwitch.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"

llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp

@@ -17,6 +17,7 @@
 #include "MCTargetDesc/MipsMCExpr.h"
 #include "MCTargetDesc/MipsMCTargetDesc.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringSwitch.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"