MDEV-9872: Valgrind supports CRC32B and CRC32Q since valgrind-3.6.1

We don't need to drop down to unoptimized crc because of valgrind now.

Valgrind-3.6.1 was released 16 February 2011.

The Power8 ASM instructions seem to be supported in 3.9.0 (31 October 2013).
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

storage/innobase/ut/ut0crc32.cc

@@ -705,7 +705,7 @@ ut_crc32_init()
 	ut_crc32_byte_by_byte = ut_crc32_byte_by_byte_sw;
 	ut_crc32_implementation = "Using generic crc32 instructions";
 
-#if defined(__GNUC__) && defined(__x86_64__) && !defined(UNIV_DEBUG_VALGRIND)
+#if defined(__GNUC__) && defined(__x86_64__)
 	uint32_t	vend[3];
 	uint32_t	model;
 	uint32_t	family;

storage/xtradb/ut/ut0crc32.cc

@@ -303,7 +303,7 @@ ut_crc32_init()
 	ut_crc32 = ut_crc32_slice8;
 	ut_crc32_implementation = "Using generic crc32 instructions";
 
-#if defined(__GNUC__) && defined(__x86_64__) && !defined(UNIV_DEBUG_VALGRIND)
+#if defined(__GNUC__) && defined(__x86_64__)
 	ib_uint32_t	vend[3];
 	ib_uint32_t	model;
 	ib_uint32_t	family;