v2: Formatting and nits fixed.

Follow up patch to arm: Use deltas for Arm switch tables
This patch moves the switch tables for Arm from the .text section
into the .rodata section.

gcc/ChangeLog:

	* config/arm/aout.h: Change to use the Lrtx label.
	* config/arm/arm.h (CASE_VECTOR_PC_RELATIVE): Remove arm targets
        from (!target_pure_code) condition.
        (ADDR_VEC_ALIGN): Add align for tables in rodata section.
	* config/arm/arm.cc (arm_output_casesi): Alter the function to include
        .Lrtx label and remove adr instructions.
	* config/arm/arm.md
        (arm_casesi_internal): Use force_reg to generate ldr instructions that
        would otherwise be out of range, and change rtl to accommodate force reg.
        Additionally remove unnecessary register temp.
        (casesi): Remove pure code check for Arm.
	* config/arm/elf.h (JUMP_TABLES_IN_TEXT_SECTION): Remove arm
        targets from JUMP_TABLES_IN_TEXT_SECTION definition.

gcc/testsuite/ChangeLog:

	* gcc.target/arm/arm-switchstatement.c: Alter the tests to
        change adr instruction to ldr.