[DOXYGEN] Fix doxygen and content issues in pmmintrin.h

- Fix incorrect wording in various intrinsic descriptions. Previously the descriptions used "low-order" and "high-order" when the intended meaning was "even-indexed" and "odd-indexed".

This patch was made by Craig Flores

Differential Revision: https://reviews.llvm.org/D41518


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@321670 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Headers/pmmintrin.h

@@ -115,8 +115,8 @@ _mm_hsub_ps(__m128 __a, __m128 __b)
   return __builtin_ia32_hsubps((__v4sf)__a, (__v4sf)__b);
 }
 
-/// \brief Moves and duplicates high-order (odd-indexed) values from a 128-bit
-///    vector of [4 x float] to float values stored in a 128-bit vector of
+/// \brief Moves and duplicates odd-indexed values from a 128-bit vector
+///    of [4 x float] to float values stored in a 128-bit vector of
 ///    [4 x float].
 ///
 /// \headerfile <x86intrin.h>
@@ -137,7 +137,7 @@ _mm_movehdup_ps(__m128 __a)
   return __builtin_shufflevector((__v4sf)__a, (__v4sf)__a, 1, 1, 3, 3);
 }
 
-/// \brief Duplicates low-order (even-indexed) values from a 128-bit vector of
+/// \brief Duplicates even-indexed values from a 128-bit vector of
 ///    [4 x float] to float values stored in a 128-bit vector of [4 x float].
 ///
 /// \headerfile <x86intrin.h>