[compiler-rt][asan] Fix overlaping parameters for memmove/memcpy on windows.

[compiler-rt][asan] Fix overlaping parameters for memmove/memcpy on windows.

Summary:
On windows, memmove and memcpy may be the same functions (on 64-bits).

```
-- f:\dd\vctools\crt\vcruntime\src\string\amd64\memcpy.asm --------------------

        OPTION PROLOGUE:NONE, EPILOGUE:NONE

        memmove = memcpy
        mov     r11, rcx                ; save destination address
```

This is causing ASAN to report overlaping parameters when instrumenting chromium.

```
D:\src\chromium\src>out\asan64\chrome.exe --no-sandbox
[8956:6208:1121/162511:ERROR:entry.cc(167)] Entry::Deserialize: dictionary has no interface_provider_specs key
[8956:11560:1121/162511:ERROR:external_registry_loader_win.cc(130)] Missing value path for key Software\Google\Chrome\Ex
tensions\doeiiacdhfmpdeckdaifnjaemmkkdlkf.
=================================================================
==5132==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges [0x000000237ee8,0x000000237eea) and [0x000000237ee9
, 0x000000237eeb) overlap
```

The error triggered on chromium:
```
Child-SP          RetAddr           Call Site
00000000`00166520 00000001`400a4886 chrome!__asan::ReportStringFunctionMemoryRangesOverlap+0x23 [d:\src\llvm\llvm\projects\compiler-rt\lib\asan\asan_report.cc @ 305]
*** WARNING: Unable to verify checksum for D:\src\chromium\src\out\asan64dynamic\libglesv2.dll
00000000`001672a0 000007fe`e1859607 chrome!__asan_wrap_memcpy+0xf6 [d:\src\llvm\llvm\projects\compiler-rt\lib\asan\asan_interceptors.cc @ 458]
00000000`00167b30 000007fe`e184bcbc libglesv2!__acrt_fp_strflt_to_string+0xb7 [d:\th\minkernel\crts\ucrt\src\appcrt\convert\_fptostr.cpp @ 86]
(Inline Function) --------`-------- libglesv2!fp_format_f+0x57 [d:\th\minkernel\crts\ucrt\src\appcrt\convert\cvt.cpp @ 578]
00000000`00167b60 000007fe`e182e2a2 libglesv2!__acrt_fp_format+0x180 [d:\th\minkernel\crts\ucrt\src\appcrt\convert\cvt.cpp @ 722]
00000000`00167bf0 000007fe`e182ce80 libglesv2!__crt_stdio_output::output_processor<char,__crt_stdio_output::stream_output_adapter<char>,__crt_stdio_output::format_validation_
```

This bug is similar to: https://llvm.org/bugs/show_bug.cgi?id=16362

Reviewers: rnk, zaks.anna, filcab

Subscribers: filcab, kubabrecka, chrisha, llvm-commits, dberris

Differential Revision: https://reviews.llvm.org/D27052

llvm-svn: 289063