[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

Essentially the same as the GEP change in r230786.

A similar migration script can be used to update test cases, though a few more
test case improvements/changes were required this time around: (r229269-r229278)

import fileinput
import sys
import re

pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)")

for line in sys.stdin:
  sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line))

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7649

llvm-svn: 230794
diff --git a/llvm/test/CodeGen/Generic/print-arith-fp.ll b/llvm/test/CodeGen/Generic/print-arith-fp.ll
index 8d49895..b00229c 100644
--- a/llvm/test/CodeGen/Generic/print-arith-fp.ll
+++ b/llvm/test/CodeGen/Generic/print-arith-fp.ll
@@ -18,8 +18,8 @@
 declare i32 @printf(i8*, ...)
 
 define i32 @main() {
-	%a = load double* @A		; <double> [#uses=12]
-	%b = load double* @B		; <double> [#uses=12]
+	%a = load double, double* @A		; <double> [#uses=12]
+	%b = load double, double* @B		; <double> [#uses=12]
 	%a_s = getelementptr [8 x i8], [8 x i8]* @a_str, i64 0, i64 0		; <i8*> [#uses=1]
 	%b_s = getelementptr [8 x i8], [8 x i8]* @b_str, i64 0, i64 0		; <i8*> [#uses=1]
 	call i32 (i8*, ...)* @printf( i8* %a_s, double %a )		; <i32>:1 [#uses=0]