[llvm] [llvm][WebAssembly] mark BR_TABLE as isIndirectBranch (PR #73391)

[Heejin Ahn via llvm-commits]

aheejin wrote:

Why do you think `BR_TABLE` is an indirect branch? It takes destination BBs. The only difference from a simple `BR` or `BR_IF` is it takes variable number of them.

https://github.com/llvm/llvm-project/pull/73391