`_handle_modification` Fails for `IfExp` Nodes

[ritzdorf]

Version Information

• vyper Version (output of vyper --version OR linkable commit hash vyperlang/vyper@): vyperlang/vyper@b43fface148b45cbd2c90b5d24f77398a63745b5

  Issue Description

When an IfExp node is passed to _handle_modification, the function fails to handle it and the compiler panics with an unhandled exception.

POC

The following examples demonstrate this behavior:

@external
def bar():
    d: DynArray[uint256, 2] = [1,2]
    (d if True else d)[1] = 1 # CompilerPanic: unhandled exception 

@external
def bar():
    d: DynArray[uint256, 2] = [1]
    x:uint256 = (d if True else d).pop() # CompilerPanic: unhandled exception

@external
def bar():
    d: DynArray[uint256, 2] = [1]
    (d if True else d).append(1) # CompilerPanic: unhandled exception