Hexagon (target/hexagon) fix store w/mem_noshuf & predicated load

Hexagon (target/hexagon) fix store w/mem_noshuf & predicated load

Call the CHECK_NOSHUF macro multiple times: once in the
fGEN_TCG_PRED_LOAD() and again in fLOAD().

Before this commit, a packet with a store and a predicated
load with mem_noshuf that gets encoded like this:

    { P0 = cmp.eq(R17,#0x0)
      memw(R18+#0x0) = R2
      if (!P0.new) R3 = memw(R17+#0x4) }

... would end up generating a branch over both the load
and the store like so:

    ...
    brcond_i32 loc17,$0x0,eq,$L1
    mov_i32 loc18,store_addr_1
    qemu_st_i32 store_val32_1,store_addr_1,leul,0
    qemu_ld_i32 loc16,loc7,leul,0
    set_label $L1
    ...

Test cases added to tests/tcg/hexagon/mem_noshuf.c

Co-authored-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220707210546.15985-2-tsimpson@quicinc.com>