Merge remote-tracking branch 'remotes/philmd/tags/mips-20210825' into staging

MIPS patches queue

- minor simplifications in PREF / JR opcodes
- merge 32-bit/64-bit Release6 decodetree definitions
- converted NEC Vr54xx extension opcodes to decodetree
- housekeeping in gen_helper() macros
- replace TARGET_WORDS_BIGENDIAN #ifdef'ry by cpu_is_bigendian()
- allow Loongson 3A1000 to use up to 48-bit VAddr

# gpg: Signature made Wed 25 Aug 2021 12:04:31 BST
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd/tags/mips-20210825: (28 commits)
  target/mips: Replace TARGET_WORDS_BIGENDIAN by cpu_is_bigendian()
  target/mips: Store CP0_Config0 in DisasContext
  target/mips: Replace GET_LMASK64() macro by get_lmask(64) function
  target/mips: Replace GET_LMASK() macro by get_lmask(32) function
  target/mips: Call cpu_is_bigendian & inline GET_OFFSET in ld/st helpers
  target/mips: Define gen_helper() macros in translate.h
  target/mips: Use tcg_constant_i32() in generate_exception_err()
  target/mips: Inline gen_helper_0e0i()
  target/mips: Inline gen_helper_1e1i() call in op_ld_INSN() macros
  target/mips: Simplify gen_helper() macros by using tcg_constant_i32()
  target/mips: Use tcg_constant_i32() in gen_helper_0e2i()
  target/mips: Remove gen_helper_1e2i()
  target/mips: Remove gen_helper_0e3i()
  target/mips: Remove duplicated check_cp1_enabled() calls in Loongson EXT
  target/mips: Allow Loongson 3A1000 to use up to 48-bit VAddr
  target/mips: Document Loongson-3A CPU definitions
  target/mips: Convert Vr54xx MSA* opcodes to decodetree
  target/mips: Convert Vr54xx MUL* opcodes to decodetree
  target/mips: Convert Vr54xx MACC* opcodes to decodetree
  target/mips: Introduce decodetree structure for NEC Vr54xx extension
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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