[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/Assembler/unnamed.ll b/llvm/test/Assembler/unnamed.ll
index 099a15a..7f79e5c 100644
--- a/llvm/test/Assembler/unnamed.ll
+++ b/llvm/test/Assembler/unnamed.ll
@@ -16,7 +16,7 @@
 @3 = global x86_fp80 0xK4001E000000000000000
 
 define float @foo(%0* %p) nounwind {
-  %t = load %0* %p                                ; <%0> [#uses=2]
+  %t = load %0, %0* %p                                ; <%0> [#uses=2]
   %s = extractvalue %0 %t, 1, 0                   ; <float> [#uses=1]
   %r = insertvalue %0 %t, double 2.000000e+00, 1, 1; <%0> [#uses=1]
   store %0 %r, %0* %p