[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/Transforms/SampleProfile/branch.ll b/llvm/test/Transforms/SampleProfile/branch.ll
index ef39093..13e362d 100644
--- a/llvm/test/Transforms/SampleProfile/branch.ll
+++ b/llvm/test/Transforms/SampleProfile/branch.ll
@@ -41,7 +41,7 @@
 
 if.end:                                           ; preds = %entry
   %arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1, !dbg !30
-  %0 = load i8** %arrayidx, align 8, !dbg !30, !tbaa !31
+  %0 = load i8*, i8** %arrayidx, align 8, !dbg !30, !tbaa !31
   %call = tail call i32 @atoi(i8* %0) #4, !dbg !30
   tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !17, metadata !{}), !dbg !30
   %cmp1 = icmp sgt i32 %call, 100, !dbg !35