[llvm] [MIRLexer][RISCV] Eat a space after the Machine comment (PR #115365)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,16 @@
+# RUN: llc %s -mtriple=riscv64 -mattr=+v -run-pass=none -o - | FileCheck %s
+
+---
+name:            test_vse8
+tracksRegLiveness: true
+body:             |
+  bb.0:
+    ; CHECK-LABEL: name: test_vse8{{$}}
+    liveins: $x10, $v8, $x11
+
+    %2:gprnox0 = COPY $x11
+    %1:vr = COPY $v8
+    %0:gpr = COPY $x10
+    PseudoVSE8_V_MF8 %1, %0, %2, 3 /* e8 */ :: (store unknown-size, align 1)
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arsenm wrote:

Check this instruction in the output 

https://github.com/llvm/llvm-project/pull/115365