* manual/macros.texi: Introduce macros to document multi
thread, asynchronous signal and asynchronous cancellation
safety properties.
* manual/intro.texi: Introduce the properties themselves.
* manual/argp.texi: Document MTASC-safety properties.
* manual/arith.texi: Document MTASC-safety properties.
* manual/conf.texi: Document MTASC-safety properties.
* manual/crypt.texi: Document MTASC-safety properties.
Fix spaces before tabs
[AArch64] Regenerate libm-test-ulps.

Re-generate libm-test-ulps from scratch.
* manual/charset.texi: Document MTASC-safety properties.
Disable x87 inline functions for SSE2 math

When i386 and x86-64 mathinline.h was merged into a single mathinline.h,
"gcc -m32" enables x87 inline functions on x86-64 even when -mfpmath=sse
and SSE2 is enabled.  It is a regression on x86-64.  We should check
__SSE2_MATH__ instead of __x86_64__ when disabling x87 inline functions.