intrinsic-test: Cleaning the IntrinsicType struct and related functionalities

[madhav-madhusoodanan]

Summary

1. Changed from IntrinsicType::target to ArmIntrinsicType::target since its usage is highly architecture-dependent.
2. Changed the structure of ArmIntrinsicType from

pub struct ArmIntrinsicType(pub IntrinsicType);

to

pub struct ArmIntrinsicType {
    pub data: IntrinsicType,
    pub target: String,
}

3. Moved arm::chunk_info to common::chunk_info.
4. Removed from_c in IntrinsicTypeDefinition trait.

r? @folkertdev
cc: @Amanieu