PPC64, fix documentation for __builtin_crypto_vpmsum* builtin functions.

PR target/91276 - Doc typos in __builtin_crypto_vpmsum*

gcc/ChangeLog:

2020-02-26  Carl Love  <cel@us.ibm.com>

	PR target/91276
	* doc/extend.texi (PowerPC AltiVec Built-in Functions available on
	ISA 3.0): The builtin-function name __builtin_crypto_vpmsumb is only
	for the vector unsigned short arguments.  It is also listed as the
	name of the built-in for arguments vector unsigned short,
	vector unsigned int and vector unsigned long long built-ins.  The
	name of the builtins for these arguments should be:
	__builtin_crypto_vpmsumh, __builtin_crypto_vpmsumw and
	__builtin_crypto_vpmsumd respectively.

Signed-off-by: Carl Love <carll@us.ibm.com>

gcc/ChangeLog

+2020-02-26  Carl Love  <cel@us.ibm.com>
+
+	PR target/91276
+	* doc/extend.texi (PowerPC AltiVec Built-in Functions available on
+	ISA 2.07): The builtin-function name __builtin_crypto_vpmsumb is only
+	for the vector unsigned short arguments.  It is also listed as the
+	name of the built-in for arguments vector unsigned short,
+	vector unsigned int and vector unsigned long long built-ins.  The
+	name of the builtins for these arguments should be:
+	__builtin_crypto_vpmsumh, __builtin_crypto_vpmsumw and
+	__builtin_crypto_vpmsumd respectively.
+
 2020-02-26  Richard Biener  <rguenther@suse.de>
 
 	* tree-vect-slp.c (vect_print_slp_tree): Also dump ref count

gcc/doc/extend.texi

@@ -20643,13 +20643,13 @@ vector unsigned long long __builtin_crypto_vpermxor (vector unsigned long long,
 vector unsigned char __builtin_crypto_vpmsumb (vector unsigned char,
                                                vector unsigned char);
 
-vector unsigned short __builtin_crypto_vpmsumb (vector unsigned short,
+vector unsigned short __builtin_crypto_vpmsumh (vector unsigned short,
                                                 vector unsigned short);
 
-vector unsigned int __builtin_crypto_vpmsumb (vector unsigned int,
+vector unsigned int __builtin_crypto_vpmsumw (vector unsigned int,
                                               vector unsigned int);
 
-vector unsigned long long __builtin_crypto_vpmsumb (vector unsigned long long,
+vector unsigned long long __builtin_crypto_vpmsumd (vector unsigned long long,
                                                     vector unsigned long long);
 
 vector unsigned long long __builtin_crypto_vshasigmad (vector unsigned long long,