[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/GlobalOpt/deadfunction.ll b/llvm/test/Transforms/GlobalOpt/deadfunction.ll
index f9a0e92..5771c4c 100644
--- a/llvm/test/Transforms/GlobalOpt/deadfunction.ll
+++ b/llvm/test/Transforms/GlobalOpt/deadfunction.ll
@@ -11,7 +11,7 @@
 entry:
   %idxprom = sext i32 %n to i64
   %arrayidx = getelementptr inbounds [3 x i8*], [3 x i8*]* @test.x, i64 0, i64 %idxprom
-  %0 = load i8** %arrayidx, align 8
+  %0 = load i8*, i8** %arrayidx, align 8
   indirectbr i8* %0, [label %a, label %b, label %c]
 
 a: