LoongArch: Emit R_LARCH_RELAX for TLS IE with non-extreme code model to allow the...

LoongArch: Emit R_LARCH_RELAX for TLS IE with non-extreme code model to allow the IE to LE linker relaxation

In Binutils we need to make IE to LE relaxation only allowed when there
is an R_LARCH_RELAX after R_LARCH_TLE_IE_PC_{HI20,LO12} so an invalid
"partial" relaxation won't happen with the extreme code model.  So if we
are emitting %ie_pc_{hi20,lo12} in a non-extreme code model, emit an
R_LARCH_RELAX to allow the relaxation.  The IE to LE relaxation does not
require the pcalau12i and the ld instruction to be adjacent, so we don't
need to limit ourselves to use the macro.

For the distro maintainers backporting changes: this change depends on
r14-8721, without r14-8721 R_LARCH_RELAX can be emitted mistakenly in
the extreme code model.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_print_operand_reloc):
	Support 'Q' for R_LARCH_RELAX for TLS IE.
	(loongarch_output_move): Use 'Q' to print R_LARCH_RELAX for TLS
	IE.
	* config/loongarch/loongarch.md (ld_from_got<mode>): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/tls-ie-relax.c: New test.
	* gcc.target/loongarch/tls-ie-norelax.c: New test.
	* gcc.target/loongarch/tls-ie-extreme.c: New test.