[llvm-c][Disassembler] Add an option to print latency information in

disassembled output alongside the instructions.
E.g., on a vector shuffle operation with a memory operand, disassembled
outputs are:
* Without the option:
    vpshufd $-0x79, (%rsp), %xmm0
    
* With the option:
    vpshufd $-0x79, (%rsp), %xmm0   ## Latency: 5

The printed latency is extracted from the schedule model available in the
disassembler context. Thus, this option has no effect if there is not a
scheduling model for the target.
This boils down to one may need to specify the CPU string, so that this
option could have an effect.

Note: Latency < 2 are not printed.

This part of <rdar://problem/14687488>.

llvm-svn: 191859

llvm/include/llvm-c/Disassembler.h

@@ -172,6 +172,8 @@ int LLVMSetDisasmOptions(LLVMDisasmContextRef DC, uint64_t Options);
 #define LLVMDisassembler_Option_AsmPrinterVariant 4
 /* The option to set comment on instructions */
 #define LLVMDisassembler_Option_SetInstrComments 8
+  /* The option to print latency information alongside instructions */
+#define LLVMDisassembler_Option_PrintLatency 16
 
 /**
  * Dispose of a disassembler context.