Hi All,

When I previously changed these offsets I had incorrectly used an offset of -2
for this Thumb2 PLT.  Unfortunately because we had no tests for this PLT I had
missed that the result was incorrect.

This patch fixes the offset to PC .-4 so that it correctly addresses the
previous instruction and adds a test for this PLT stub.

build on native hardware and regtested on
  arm-none-elf, arm-none-elf (32 bit host),
  arm-none-linux-gnueabihf, arm-none-linux-gnueabihf (32 bit host)

Cross-compiled and regtested on
  arm-none-linux-gnueabihf, armeb-none-elf, arm-wince-pe

and no issues.

Ok for master? and for backport to binutils-2.34?

Thanks,
Tamar

bfd/ChangeLog:

2020-03-30  Tamar Christina  <tamar.christina@arm.com>

	* elf32-arm.c (elf32_thumb2_plt_entry): Fix PC-rel offset.

ld/ChangeLog:

2020-03-30  Tamar Christina  <tamar.christina@arm.com>

	* testsuite/ld-arm/arm-elf.exp (thumb-plt): New.
	* testsuite/ld-arm/thumb-plt.d: New test.
	* testsuite/ld-arm/thumb-plt.s: New test.

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