[Wasm RyuJit] codegen for loading a register-sized struct local

[AndyAyersMS]

No description provided.

[AndyAyersMS]

fyi @dotnet/jit-contrib

Fixes SPC debug assert (2) in #125756 (comment)

We have a struct-typed use feeding an int-typed store:

Compiling [S.P.CoreLib]System.Array.Initialize()
Single method repro args:--singlemethodtypename "System.Array" --singlemethodname "Initialize" --singlemethodindex 1
****** START compiling System.Array:Initialize():this (MethodHash=5b13e318

... (codegen) ...

N002 (???,???) [000010] DA--G+-----                   t10 =    LCL_ADDR  int    V04 loc2         [+0]
N001 (???,???) [000009] -----+-----                    t9 =    LCL_VAR   struct<System.Runtime.CompilerServices.TypeHandle, 4> V17 tmp1         
                                                            /--*  t10    int    
                                                            +--*  t9     struct 
               [000210] sA--G------                         *  STOREIND  int 

[Copilot]

Pull request overview

Updates Wasm RyuJit local variable codegen to correctly load “register-sized” struct locals by using an appropriate memory attribute (emitAttr) when emitting the load.

Changes:

• Adjusted load emission to derive emitAttr from the register type when the node is TYP_STRUCT
• Added an assert to catch EA_UNKNOWN attributes before emitting the load

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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