Correct auto-detected CPU type for Raspberry Pi

The Raspberry Pi CPU is misdetected by LLVM, which means that hardware floating point instructions are not disassembled properly. `codegen.cpp` already has a work-around for this problem, explicitly enabling hardware floating point instructions on ARM systems. This patch is the counterpart for disassembling code.

src/disasm.cpp

@@ -296,6 +296,12 @@ void jl_dump_asm_internal(uintptr_t Fptr, size_t Fsize, size_t slide,
  Triple TheTriple(Triple::normalize(TripleName));
 
  std::string MCPU = sys::getHostCPUName();
+#ifdef _CPU_ARM_
+ // The Raspberry Pi CPU is misdetected by LLVM (at least of version
+ // 3.6); correct this.
+ if (MCPU == "arm1176jz-s")
+ MCPU = "arm1176jzf-s";
+#endif
  SubtargetFeatures Features;
  Features.getDefaultSubtargetFeatures(TheTriple);