Eliminate "const" from extern const to fix breakeage since r135184 on msvc.

MSVC decorates (and distinguishes) "const" in mangler. It brought linkage error between "extern const" declarations and definitions.

llvm-svn: 135269
diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp
index d671c0b..325a3ed 100644
--- a/llvm/lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp
+++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp
@@ -72,7 +72,7 @@
 ///
 
 namespace llvm {
-extern const MCInstrDesc ARMInsts[];
+extern MCInstrDesc ARMInsts[];
 }
 
 using namespace llvm;
diff --git a/llvm/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp b/llvm/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp
index 0157b4e..88d80a1 100644
--- a/llvm/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp
+++ b/llvm/lib/Target/MBlaze/Disassembler/MBlazeDisassembler.cpp
@@ -30,7 +30,7 @@
 #include "MBlazeGenEDInfo.inc"
 
 namespace llvm {
-extern const MCInstrDesc MBlazeInsts[];
+extern MCInstrDesc MBlazeInsts[];
 }
 
 using namespace llvm;