[rs6000] PR89338, PR89339: Fix compat vector intrinsics for BE and 32-bit

[rs6000] PR89338, PR89339: Fix compat vector intrinsics for BE and 32-bit

Test FAILS: sse2-cvtpd2dq-1, sse2-cvtpd2ps, sse2-cvttpd2dq on powerpc64
(big-endian).

_mm_cvtpd_epi32, _mm_cvtpd_ps, _mm_cvttpd_epi32: Type conversion from
vector doubleword type to vector word type leaves the results in even
lanes in big endian mode.

Test FAILS: sse-cvtss2si-1, sse-cvtss2si-2, sse-movmskb-1 on powerpc
(32-bit big-endian).

Incorrect type for interpreting the result from mfvsrd instruction leads
to incorrect results.  Also, mfvsrd instruction only works as expected in
64-bit mode or for 32-bit quantities in 32-bit mode.  A more general,
if slower, solution is needed for 32-bit mode.

2019-02-25  Paul A. Clarke  <pc@us.ibm.com>

[gcc]

	* config/rs6000/emmintrin.h (_mm_cvtpd_epi32): Fix big endian.
	(_mm_cvtpd_ps): Likewise.
	(_mm_cvttpd_epi32): Likewise.

	PR target/89338
	* config/rs6000/xmmintrin.h (_mm_cvtss_f32):  Fix type mismatch.
	(_mm_cvt_ss2si): Fix type mismatch and 32-bit.

	PR target/89339
	* config/rs6000/xmmintrin.h (_mm_movemask_pi8): Fix 32-bit.

From-SVN: r269195