utils/*.sh: Prefer /usr/bin/env bash for portability. (#3697)

Fixes use on NixOS.

utils/build-release.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/build-release.sh - Build Release ----------------*- Script -*-===##
 # 
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

utils/equiv-rtl.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/equiv-rtl.sh - Formal Equivalence via yosys------*- Script -*-===##
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

utils/get-capnp.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/get-capnp.sh - Install CapnProto ----------------*- Script -*-===##
 # 
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

utils/get-iverilog.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/get-iverilog.sh - Install Icarus Verilog ---------*- Script -*-===##
 # 
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

utils/get-or-tools.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/get-or-tools.sh - Install OR-Tools --------------*- Script -*-===##
 # 
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

utils/get-verilator.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/get-verilator.sh - Install Verilator ------------*- Script -*-===##
 # 
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

utils/update-docs-dialects.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 ##===- utils/update-docs-dialects.sh - build dialect diagram -*- Script -*-===##
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.