Enable "set -euo pipefail" in all bash scripts.

This enables "set -e", "set -u", and "set -o pipefail", which
catch common errors.

check-rustfmt.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
-#
+set -euo pipefail
+
 # Usage: check-rustfmt.sh [--install]
 #
 # Check that the desired version of rustfmt is installed.

cranelift/format-all.sh

@@ -1,10 +1,8 @@
 #!/bin/bash
+set -euo pipefail
 
 # Format all sources using rustfmt.
 
-# Exit immediately on errors.
-set -e
-
 cd $(dirname "$0")
 
 # Make sure we can find rustfmt.

cranelift/publish-all.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-set -e
+set -euo pipefail
 cd $(dirname "$0")
 topdir=$(pwd)
 

cranelift/test-all.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 # This is the top-level test script:
 #
@@ -10,9 +11,6 @@
 #
 # All tests run by this script should be passing at all times.
 
-# Exit immediately on errors.
-set -e
-
 # Repository top-level directory.
 cd $(dirname "$0")
 topdir=$(pwd)

lib/cretonne/meta/check.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-set -e
+set -euo pipefail
 cd $(dirname "$0")
 
 runif() {