Fix a few non-dash safe xstormy16 shell scripts.

Noticed by a customer while looking at a tangentially related problem.  The
gas testsuite for xstormy16 has two scripts that have a typo on the first
line, they are missing the !.  They also use shell syntax that doesn't work
on a system where /bin/sh is dash.  So I fixed the typo, changed the shell
to bash, and made them executable, so that they now work when run directly
even if /bin/sh is dash.

	gas/
	* testsuite/gas/xstormy16/allinsn.sh: Change first line to
	#!/bin/bash and make it executable.
	* testsuite/gas/xstormy16/gcc.sh: Likewise.

gas/ChangeLog

@@ -1,3 +1,9 @@
+2019-06-26  Jim Wilson  <jimw@sifive.com>
+
+	* testsuite/gas/xstormy16/allinsn.sh: Change first line to
+	#!/bin/bash and make it executable.
+	* testsuite/gas/xstormy16/gcc.sh: Likewise.
+
 2019-06-26  Lili Cui  <lili.cui@intel.com>
 
 	* doc/c-i386.texi: Document x/y/z instruction sufffixes in AT&T

gas/testsuite/gas/xstormy16/allinsn.sh

@@ -1,4 +1,4 @@
-#/bin/sh
+#!/bin/bash
 # Generate test result data for xstormy16 GAS testing.
 # This script is machine generated.
 # It is intended to be run in the testsuite source directory.

gas/testsuite/gas/xstormy16/gcc.sh

@@ -1,4 +1,4 @@
-#/bin/sh
+#!/bin/bash
 # Generate test result data for xstormy16 GAS testing.
 # It is intended to be run in the testsuite source directory.
 #