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vpx_ports/x86.h: sync with aom_ports/x86.h

adds a few comments and makes the file ascii:
854b2766a Replace non-ASCII characters

Change-Id: I6c2d76b293158bcad9f1ded7a91a81bda1e700fb

--- a/vpx_ports/x86.h

+++ b/vpx_ports/x86.h

@@ -242,7 +242,7 @@

 // x86_readtsc directly, but prevent the CPU's out-of-order execution from

 // affecting the measurement (by having earlier/later instructions be evaluated

 // in the time interval). See the white paper, "How to Benchmark Code

-// Execution Times on Intel® IA-32 and IA-64 Instruction Set Architectures" by

+// Execution Times on Intel(R) IA-32 and IA-64 Instruction Set Architectures" by

 // Gabriele Paoloni for more information.

 //

 // If you are timing a large function (CPU time > a couple of seconds), use

@@ -308,6 +308,7 @@

 static INLINE unsigned int x86_tsc_start(void) {

   unsigned int reg_eax, reg_ebx, reg_ecx, reg_edx;

+  // This call should not be removed. See function notes above.

   cpuid(0, 0, reg_eax, reg_ebx, reg_ecx, reg_edx);

   // Avoid compiler warnings on unused-but-set variables.

   (void)reg_eax;

@@ -320,6 +321,7 @@

 static INLINE unsigned int x86_tsc_end(void) {

   uint32_t v = x86_readtscp();

   unsigned int reg_eax, reg_ebx, reg_ecx, reg_edx;

+  // This call should not be removed. See function notes above.

   cpuid(0, 0, reg_eax, reg_ebx, reg_ecx, reg_edx);

   // Avoid compiler warnings on unused-but-set variables.

   (void)reg_eax;