[MLIR] NFC. Rename pass cmd-line to prefix affine

[bondhugula]

Summary

Prefix "affine-" to affine transform passes that were missing it -- to
avoid ambiguity and for uniformity. There were only two needed this.

Move mispaced affine coalescing test case file.

NFC.

[rriddle]

Nice!

mlir/include/mlir/Dialect/Affine/Passes.td

def AffineParallelize : Pass<"affine-parallelize", "FuncOp"> {
   ];
 }
 
 def AffineLoopNormalize : Pass<"affine-loop-normalize", "FuncOp"> {
   let summary = "Apply normalization transformations to affine loop-like ops";
   let constructor = "mlir::createAffineLoopNormalizePass()";
 }
 
-def LoopCoalescing : Pass<"loop-coalescing", "FuncOp"> {
+def LoopCoalescing : Pass<"affine-loop-coalescing", "FuncOp"> {
   let summary = "Coalesce nested loops with independent bounds into a single "
                 "loop";
   let constructor = "mlir::createLoopCoalescingPass()";
   let dependentDialects = ["arith::ArithmeticDialect"];
 }
 
-def SimplifyAffineStructures : Pass<"simplify-affine-structures", "FuncOp"> {
+def SimplifyAffineStructures : Pass<"affine-simplify-structures", "FuncOp"> {
   let summary = "Simplify affine expressions in maps/sets and normalize "
                 "memrefs";
   let constructor = "mlir::createSimplifyAffineStructuresPass()";
 }
 
 #endif // MLIR_DIALECT_AFFINE_PASSES

mlir/test/Dialect/Affine/loop-coalescing.mlir

-// RUN: mlir-opt -split-input-file -allow-unregistered-dialect -loop-coalescing %s | FileCheck %s
+// RUN: mlir-opt -split-input-file -allow-unregistered-dialect -affine-loop-coalescing %s | FileCheck %s
 
 // CHECK-LABEL: @one_3d_nest
 func @one_3d_nest() {
   // Capture original bounds.  Note that for zero-based step-one loops, the
   // upper bound is also the number of iterations.
   // CHECK: %[[orig_lb:.*]] = arith.constant 0
   // CHECK: %[[orig_step:.*]] = arith.constant 1
   // CHECK: %[[orig_ub_k:.*]] = arith.constant 3

mlir/test/Dialect/Affine/simplify-structures.mlir

-// RUN: mlir-opt -allow-unregistered-dialect %s -split-input-file -simplify-affine-structures | FileCheck %s
+// RUN: mlir-opt -allow-unregistered-dialect %s -split-input-file -affine-simplify-structures | FileCheck %s
 
 // CHECK-DAG: #[[$SET_2D:.*]] = affine_set<(d0, d1) : (d0 - 100 == 0, d1 - 10 == 0, -d0 + 100 >= 0, d1 >= 0)>
 // CHECK-DAG: #[[$SET_7_11:.*]] = affine_set<(d0, d1) : (d0 * 7 + d1 * 5 + 88 == 0, d0 * 5 - d1 * 11 + 60 == 0, d0 * 11 + d1 * 7 - 24 == 0, d0 * 7 + d1 * 5 + 88 == 0)>
 
 // An external function that we will use in bodies to avoid DCE.
 func private @external() -> ()
 
 // CHECK-LABEL: func @test_gaussian_elimination_empty_set0() {