[CodeGen] Unify MBB reference format in both MIR and debug output

As part of the unification of the debug format and the MIR format, print
MBB references as '%bb.5'.

The MIR printer prints the IR name of a MBB only for block definitions.

* find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)->getNumber\(\)/" << printMBBReference(*\1)/g'
* find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)\.getNumber\(\)/" << printMBBReference(\1)/g'
* find . \( -name "*.txt" -o -name "*.s" -o -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#([0-9]+)/%bb.\1/g'
* grep -nr 'BB#' and fix

Differential Revision: https://reviews.llvm.org/D40422

llvm-svn: 319665
diff --git a/llvm/test/CodeGen/WebAssembly/dbgvalue.ll b/llvm/test/CodeGen/WebAssembly/dbgvalue.ll
index dc108ff..438bea3 100644
--- a/llvm/test/CodeGen/WebAssembly/dbgvalue.ll
+++ b/llvm/test/CodeGen/WebAssembly/dbgvalue.ll
@@ -1,8 +1,8 @@
 ; RUN: llc < %s -O0 -verify-machineinstrs -mtriple=wasm32-unknown-unknown-wasm | FileCheck %s
 
-; CHECK: BB#0
+; CHECK: %bb.0
 ; CHECK: #DEBUG_VALUE: usage:self <- %4
-; CHECK: BB#1
+; CHECK: %bb.1
 ; CHECK: DW_TAG_variable
 source_filename = "test/CodeGen/WebAssembly/dbgvalue.ll"
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
diff --git a/llvm/test/CodeGen/WebAssembly/signext-arg.ll b/llvm/test/CodeGen/WebAssembly/signext-arg.ll
index cd116c6..32d74a2 100644
--- a/llvm/test/CodeGen/WebAssembly/signext-arg.ll
+++ b/llvm/test/CodeGen/WebAssembly/signext-arg.ll
@@ -5,7 +5,7 @@
 
 define i32 @func_1(i16 %arg1 , i32 %arg2) #0 {
 ; CHECK-LABEL: func_1:
-; CHECK:       # BB#0: # %entry
+; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    i32.const $push1=, 16
 ; CHECK-NEXT:    i32.shl $push2=, $0, $pop1
 ; CHECK-NEXT:    i32.const $push4=, 16