remove support for reading llvm 2.9 .bc files. LLVM 3.1 is only compatible back to 3.0

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145164 91177308-0d34-0410-b5e6-96231b3b80d8

test/Bitcode/AutoUpgradeGlobals.ll

@@ -1,4 +0,0 @@
-; This isn't really an assembly file. It just runs test on bitcode to ensure
-; it is auto-upgraded.
-; RUN: llvm-dis < %s.bc | FileCheck %s 
-; CHECK-NOT: {i32 @\\.llvm\\.eh}

test/Bitcode/fbench-llvm-2.9.ll

@@ -1,5 +0,0 @@
-; This isn't really an assembly file. It just runs the test on the bitcode to 
-; ensure bitcode file backward compatibility.  No need for FileCheck as the 
-; BitcodeReader will fail with an assert if broken. This test case was 
-; generated using a clang binary, based on LLVM 2.9, downloaded from llvm.org.
-; RUN: llvm-dis < %s.bc > /dev/null

test/Bitcode/spirit-llvm-2.9.ll

@@ -1,5 +0,0 @@
-; This isn't really an assembly file. It just runs the test on the bitcode to 
-; ensure bitcode file backward compatibility.  No need for FileCheck as the 
-; BitcodeReader will fail with an assert if broken. This test case was 
-; generated using a clang binary, based on LLVM 2.9, downloaded from llvm.org.
-; RUN: llvm-dis < %s.bc > /dev/null