fix(ssa): revert unnecessary formatting changes

Reverted two unnecessary formatting changes based on code review:
- ssa/interface.go: Restored single-line format for val function
- ssa/abitype.go: Moved pkg variable declaration back to original position

These changes don't affect functionality, just code formatting.

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>

ssa/interface.go

@@ -249,9 +249,7 @@ func (b Builder) TypeAssert(x Expr, assertedTyp Type, commaOk bool) Expr {
 	} else {
 		if rawIntf, ok := assertedTyp.raw.Type.Underlying().(*types.Interface); ok {
 			eq = b.InlineCall(b.Pkg.rtFunc("Implements"), tabi, tx)
-			val = func() Expr {
-				return Expr{b.unsafeInterface(rawIntf, tx, b.faceData(x.impl)), assertedTyp}
-			}
+			val = func() Expr { return Expr{b.unsafeInterface(rawIntf, tx, b.faceData(x.impl)), assertedTyp} }
 		} else {
 			eq = b.BinOp(token.EQL, tx, tabi)
 			val = func() Expr { return b.valFromData(assertedTyp, b.faceData(x.impl)) }