[patch/sra] Fix pr 42833

[Richard Henderson]

The problem displayed in this test case is that we get confused as to 
where to insert the new code we generate.  We end up with

   D.2888_153 = VIEW_CONVERT_EXPR<uint32_t>(vdest);
   vdest.v1 = vdest$v1_154;
   vdest.v2 = vdest$v2_152;
   vdest.v3 = vdest$v3_151;
   vdest.v4 = vdest$v4_150;
   conv_u$i_171 = D.2888_153;

instead of the correct

   vdest.v1 = vdest$v1_154;
   vdest.v2 = vdest$v2_152;
   vdest.v3 = vdest$v3_151;
   vdest.v4 = vdest$v4_150;
   D.2888_153 = VIEW_CONVERT_EXPR<uint32_t>(vdest);
   conv_u$i_171 = D.2888_153;

A workable solution appears to be simply to delay re-gimplification of 
the original instruction until after the components have been placed.

Ok?


r~
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