[lldb] Temporarily remove --arch flag to dotest

We're trying to move the matrix bot to arm64. But specifying the
`--arch=arm64` isn't behaving as we expect. For some reason both
`--arch=arm64` *and* `--arch=x86_64` are passed to the tests, which
might be the reason why they're failing.

Try to remove it for now and see if that changes anything.

Author: Michael137

zorg/jenkins/build.py

@@ -654,7 +654,7 @@ def lldb_cmake_standalone_builder(target):
                  test_dir, test_build_dir])
     cmake_build_type = conf.cmake_build_type if conf.cmake_build_type else 'RelWithDebInfo'
     dotest_args = [
-        '--arch', 'x86_64', '--build-dir', test_build_dir,
+        '--build-dir', test_build_dir,
         '-t', '--env', 'TERM=vt100'
     ]
     dotest_args.extend(conf.dotest_flags)

zorg/jenkins/jobs/jobs/lldb-cmake-matrix

@@ -102,7 +102,6 @@ pipeline {
                       --runtimes="libcxx;libcxxabi;libunwind"  \
                       --cmake-type=Release \
                       --dotest-flag="--skip-category gmodules" \
-                      --dotest-flag="--arch=arm64"
                     '''
                     script {
                         def LLDB = new org.swift.LLDB()
@@ -133,7 +132,6 @@ pipeline {
                       --dotest-flag="llgs" \
                       --dotest-flag="--skip-category" \
                       --dotest-flag="debugserver" \
-                      --dotest-flag="--arch=arm64" \
                       --dotest-flag="--dwarf-version=2"
 
                     # Give the system some time to recover.
@@ -165,7 +163,6 @@ pipeline {
 		      --dotest-flag="llgs" \
 		      --dotest-flag="--skip-category" \
 		      --dotest-flag="debugserver" \
-                      --dotest-flag="--arch=arm64" \
                       --dotest-flag="--dwarf-version=4"
 
                     # Give the system some time to recover.
@@ -197,7 +194,6 @@ pipeline {
 		      --dotest-flag="llgs" \
 		      --dotest-flag="--skip-category" \
 		      --dotest-flag="debugserver" \
-                      --dotest-flag="--arch=arm64" \
                       --dotest-flag="--dwarf-version=5"
 
                     # Give the system some time to recover.
@@ -266,7 +262,6 @@ pipeline {
                       --dotest-flag="llgs" \
                       --dotest-flag="--skip-category" \
                       --dotest-flag="debugserver" \
-                      --dotest-flag="--arch=arm64"
 
                     # Give the system some time to recover.
                     sleep 120
@@ -336,7 +331,6 @@ pipeline {
                       --dotest-flag="llgs" \
                       --dotest-flag="--skip-category" \
                       --dotest-flag="debugserver" \
-                      --dotest-flag="--arch=arm64"
 
                     # Give the system some time to recover.
                     sleep 120