Commits on Jul 15, 2021

1. aarch64: Fix lowering amounts for shifts …

   This commit addresses two issues:
   * A panic when shifting any non i128 type by i128 amounts (bytecodealliance#3064)
   * Wrong results when lowering shifts with small types (i8, i16)
   
   In these types when shifting for amounts larger than the size of the
   type, we would not get the wrapping behaviour that we see on i32 and i64.
   This is because in these larger types, the wrapping behaviour is automatically
   implemented by using the appropriate instruction, however we do not
   have i8 and i16 specific instructions, so we have to manually wrap
   the shift amount with an AND instruction.
   
   This issue is also found on x86_64 and s390x, and a separate issue will
   be filed for those.
   
   Closes bytecodealliance#3064

   

   afonso360 committed Jul 15, 2021
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